BACKGROUND
1. Technical Field
[0001] The present disclosure relates generally to microwave applicator probes used in tissue
ablation procedures. More particularly, the present disclosure is directed to a microwave
probe that can be tuned during ablation procedures to obtain a desired impedance match.
2. Background of Related Art
[0002] Treatment of certain diseases requires destruction of malignant tissue growths (e.g.,
tumors). It is known that tumor cells denature at elevated temperatures that are slightly
lower than temperatures injurious to surrounding healthy cells. Therefore, known treatment
methods, such as hyperthermia therapy, heat tumor cells to temperatures above 41°C,
while maintaining adjacent healthy cells at lower temperatures to avoid irreversible
cell damage. Such methods involve applying electromagnetic radiation to heat tissue
and include ablation and coagulation of tissue. In particular, microwave energy is
used to coagulate and/or ablate tissue to denature or kill the cancerous cells.
[0003] Microwave energy is applied via microwave ablation antenna probes which penetrate
tissue to reach tumors. There are several types of microwave probes, such as monopole,
dipole, and helical. In monopole and dipole probes, microwave energy radiates perpendicularly
from the axis of the conductor. Monopole probe (e.g., antenna) includes a single,
elongated microwave conductor surrounded by a dielectric sleeve, having a conductor
exposed at the end of the probe. Dipole probes have a coaxial construction including
an inner conductor and an outer conductor separated by a dielectric portion. More
specifically, dipole microwave antennas have a long, thin inner conductor which extends
along a longitudinal axis of the probe and is surrounded by an outer conductor. In
certain variations, a portion or portions of the outer conductor may be selectively
removed to provide for more effective outward radiation of energy. This type of microwave
probe construction is typically referred to as a "leaky waveguide" or "leaky coaxial"
antenna.
[0004] In helical probes, microwave energy is directed in a forward direction. This is due
to microwave energy radiating perpendicularly from the antenna, which when in helical
configuration directs the energy waves in a forward direction. In helical probes the
inner conductor is formed in a uniform spiral pattern (e.g., a helix) to provide the
required configuration for effective radiation.
[0005] Conventional microwave probes have a narrow operational bandwidth, a wavelength range
at which optimal operational efficiency is achieved, and hence, are incapable of maintaining
a predetermined impedance match between the microwave delivery system (e.g., generator,
cable, etc.) and the tissue surrounding the microwave probe. More specifically, as
microwave energy is applied to tissue, the dielectric constant of the tissue immediately
surrounding the microwave probe decreases as the tissue is cooked. The drop causes
the wavelength of the microwave energy being applied to tissue to increase beyond
the bandwidth of the probe. As a result, there is a mismatch between the bandwidth
of conventional microwave probe and the microwave energy being applied. Thus, narrow
band microwave probes may detune as a result of steam generation and phase transformation
of the tissue hindering effective energy delivery and dispersion.
[0006] US 2005/0245919 A1 relates to an antenna for microwave tissue ablation. It comprises a coaxial conductor
providing a central first conductor surrounded by an insolating dielectric layer in
turn surrounded by a second outer coaxial shield. The central conductor with or without
the dielectric layer extends a distance L2 out from the conductor of the shield whereas
the shield extends a distance L1 out from the conductor.
SUMMARY
[0007] The present disclosure provides for a microwave ablation probe which can be dynamically
matched and/or tuned during ablation. As tissue is ablated, the radiating portion
of the probe is actively tuned so that an optimal impedance match is achieved for
a desired procedure. This is accomplished by adjusting the shape, size and/or dielectric
properties of the components of the probe (e.g., adjusting the length of the conductors,
insulating layers, and the like). In monopole and/or dipole antennas, the length of
an inner conductor is adjusted to create a more efficient radiator.
[0008] According to one embodiment of the present disclosure a microwave ablation probe
for providing microwave energy to tissue is disclosed. The probe includes a feedline
having an inner conductor, a secondary inner conductor, an insulating spacer, and
an outer conductor. The inner conductor is slidably disposed within the secondary
inner conductor. The feedline also includes a radiating portion having an extruded
portion of the inner conductor centrally disposed therein, wherein longitudinal movement
of the inner conductor relative to the feedline tunes the radiating portion.
[0009] According to another embodiment of the present disclosure a microwave ablation probe
for providing microwave energy to tissue is disclosed. The probe includes a feedline
having an inner conductor, an insulating spacer and an outer conductor, and a radiating
portion having an extruded portion of the inner conductor which is centrally disposed
therein. The probe also includes a choke disposed around at least a portion of the
feedline and configured to confine the microwave energy to the radiating portion.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The above and other aspects, features, and advantages of the present disclosure will
become more apparent in light of the following detailed description when taken in
conjunction with the accompanying drawings in which:
Fig. 1 is a schematic diagram of a microwave ablation system according to the present
disclosure;
Fig. 2 is a perspective cross-sectional view of a microwave ablation probe according
to the present disclosure;
Figs. 3A-C are side cross-sectional views of the microwave ablation probe of Fig.
2;
Fig. 4 is a perspective cross-sectional view of the microwave ablation probe having
liquid cooled choke according to the present disclosure; and
Fig. 5 is a perspective cross-sectional view of one embodiment of the microwave ablation
probe having a thermally reactive dielectric material therein according to the present
disclosure.
[0011] The invention is defined in the claims.
DETAILED DESCRIPTION
[0012] Particular embodiments of the present disclosure will be described herein below with
reference to the accompanying drawings. In the following description, well-known functions
or constructions are not described in detail to avoid obscuring the present disclosure
in unnecessary detail.
[0013] Fig.1 shows a microwave ablation system 10 which includes a microwave ablation probe
12 coupled to a microwave generator 14 via a flexible coaxial cable 16 that is coupled
to a connector of the generator 14. The generator 14 is configured to provide microwave
energy at an operational frequency from about 500 MHz to about 2500 MHz.
[0014] During microwave ablation, the probe 12 is inserted into tissue and microwave energy
is supplied thereto. As tissue surrounding the probe 12 is ablated, the tissue undergoes
desiccation and denaturization which results in a drop of the effective dielectric
constant of the tissue. The drop in the effective dielectric constant, in turn, lengthens
the wavelength of the microwave energy. Since the frequency is held constant during
ablation, the increase in the wavelength results in the increase of the operational
frequency. At the outset the probe 12 is at an initial match point - a predetermined
operational frequency that increases to a higher frequency as the ablation continues.
Thus, to maintain an impedance match between the probe 12 and the generator 14, the
radiating properties of the probe 12 are dynamically adjusted throughout the procedure.
This is accomplished by modifying the geometry and/or the dielectric properties of
the probe 12.
[0015] Fig. 2 shows one embodiment of the probe 12 including a feedline 26, a choke 28 and
an adjustable radiating portion 30. The feedline 26 extends between the distal end
of the probe 12 where the feedline 26 is coupled to the cable 16, to the radiating
portion 30. The feedline 26 is constructed from a coaxial cable having an inner conductor
20 (e.g., wire) surrounded by an insulating spacer 22 which is then surrounded by
an outer conductor 24 (e.g., cylindrical conducting sheath). In one embodiment, the
feedline 26 may have a diameter of 2.16 mm (0.085 inches) and the insulating spacer
22 may have a dielectric constant of 1.7.
[0016] The feedline 26 may be flexible or semi-rigid and may be of variable length from
a proximal end of the radiating portion 30 to a distal end of the cable 16 ranging
from about 2.54 cm to about 25.4 cm (1 to about 10 inches). The inner conductor 20
and the outer conductor 24 may be constructed from a variety of metals and alloys,
such as copper, gold, stainless steel, and the like. Metals may be selected based
on a variety of factors, such as conductivity and tensile strength. Thus, although
stainless steel has lower conductivity than copper and/or gold, it provides the strength
required to puncture tissue and/or skin. In such cases, the inner and outer conductors
20 and 24 may be plated with conductive material (e.g., copper, gold, etc.) to improve
conductivity and/or decrease energy loss.
[0017] In one embodiment, the feedline 26 includes a secondary inner conductor 23, as shown
in Fig. 3A, having a tubular structure which surrounds the inner conductor 20. The
inner conductor 20 is slidably disposed within the secondary inner conductor 23 (e.g.,
moves within the secondary inner conductor 23 while maintaining smooth continuous
contact therewith), such that the inner conductor 20 can be slid in either the proximal
and/or distal direction to tune the inner conductor 20 to a desired operational frequency.
The inner conductor 20 and the secondary inner conductor 23 are in electromechanical
contact, allowing the inner conductor 20 to slide in and out of the feedline 26 during
tuning while continuing to conduct microwave energy.
[0018] As shown in Fig. 3B, the feedline 26 includes one or more grooves 25 which mechanically
interface with one or more corresponding stop members 27 disposed on the inner conductor
20. The groove 25, may be disposed in the secondary inner conductor 23 and/or the
insulative spacer 22. The groove 25 in conjunction with the corresponding stop member
27, guides and limits the movement of the inner conductor 20 as the inner conductor
20 is slid within the feedline 26. Further, the groove 25 and stop member 27 combination
provides for additional conductive contact between the secondary inner conductor 23
and the inner conductor 20. In embodiments, the location of the groove 25 and the
stop member 27 may be interchanged, such that the groove 25 may be disposed within
the inner conductor 20 and the stop member 27 may be disposed on the secondary inner
conductor 23.
[0019] With reference to Fig. 2, the choke 28 of the probe 12 is disposed around the feedline
26 and includes an inner dielectric layer 32 and an outer conductive layer 34. The
choke 28 confines the microwave energy from the generator 14 to the radiating portion
30 of the probe 12 thereby limiting the microwave energy deposition zone length along
the feedline 26. The choke 28 is implemented with a quarter wave short by using the
outer conductive layer 34 around the outer conductor 24 of the feedline 26 separated
by the dielectric layer 32. The choke 28 is shorted to the outer conductor 24 of the
feedline 26 at the proximal end of the choke 28 by soldering or other means. In embodiments,
the length of the choke 28 may be from a quarter to a full wavelength. The choke 28
acts as a high impedance to microwave energy conducted down the outside of the feedline
26 thereby limiting energy deposition to the end of the probe. In one embodiment,
the dielectric layer 32 is formed from a fluoropolymer such as tetrafluorethylene,
perfluorpropylene, and the like and has a thickness of 0.127 mm (0.005 inches). The
outer conductive layer 34 may be formed from a so-called "perfect conductor" material
such as a highly conductive metal (e.g., copper).
[0020] As shown in Fig. 3C, the choke 28 is configured to slide atop the feedline 26 along
the longitudinal axis defined by the probe 12. Sliding the choke 28 in either proximal
and/or distal direction along the feedline 26 provides for adjustment of the length
of the radiating portion 30. The choke 28 includes a groove 33 disposed within the
dielectric layer 32. The groove 33 is configured to mechanically interface with a
stop member 35 that is disposed on the outer conductor 24. The stop member 35 guides
the sliding of the choke 28 along the length of the groove 33.
[0021] Moving one or both of the inner conductor 20 and the choke 28 relative to the feedline
26 allows for adjustment of the length of the radiating portion 30, such as adjusting
the choke 28 and the inner conductor 20 to be ¼ wavelength long as the ablation continues
to maintain ½ wavelength dipole. In embodiments, the inner conductor 20, the feedline
26 and the choke 28 may have markings and/or indicia thereon to indicate desired wavelength
adjustment positions.
[0022] In one embodiment, the grooves 25 and 33 and/or the stop members 27 and 35 may include
one or more detents (not explicitly shown) which provide tactile feedback when the
choke 28 and/or inner conductor 20 are slid along the feedline 26. This allows for
more precise movement of the components and tuning of the radiating portion 30.
[0023] The probe 12 further includes a tapered end 36 which terminates in a tip 38 at the
distal end of the radiating portion 30. The tapered end 36 allows for insertion of
the probe 12 into tissue with minimal resistance. In cases where the radiating portion
12 is inserted into a pre-existing opening, the tip 38 may be rounded or flat. The
tapered end 36 may be formed from any hard material such as metal and/or plastic.
[0024] Fig. 4 shows another embodiment of the probe 12 having a liquid-cooled choke 40 that
includes a cylindrical conducting housing 42 having a chamber 44 and defining a cylindrical
cavity 46 which surrounds the feedline 26. The housing 42 is formed from a conducting
metal such as copper, stainless steel, and/or alloys thereof. The housing 42 includes
one or more inlet tubes 48 and outlet tubes 50 which cycle a cooling dielectric liquid
52 (e.g., water, saline solution, and the like) through the chamber 44. The liquid
52 may be supplied by a pump (not explicitly shown) configured to adjust the flow
rate of the liquid 52 through the chamber 44. As the liquid 52 is supplied into the
choke 40, the heat generated by the feedline 26 is removed. Further, compounds used
in the liquid 52 may be adjusted to obtain a desired dielectric constant within the
choke 28. This may be useful in multifrequency probes allowing the resonant frequency
of the choke 28 to be adjusted by filling the chamber 44 with varying fluid volume
and/or varying the ratio of air and liquid therein.
[0025] The housing 42 also includes an O-ring 54 having an opening 56 allowing the O-ring
54 to fit within the chamber 44. As the chamber 44 is filled with the liquid 52, the
liquid 52 pushes the O-ring 54 in the distal direction within the chamber 44. The
O-ring 54 fits the walls of the chamber 44 in a substantially liquid-tight fashion
preventing the liquid 52 from seeping into a distal portion 58 of the chamber 44.
This allows selective or automatic adjustment of the cooling temperature of the choke
28 by limiting the volume of the chamber 44 being filled with the liquid 52.
[0026] More specifically, the O-ring 54 is formed from rubber, silicone rubber and other
elastomer material such that the frictional forces between the O-ring 54 and the housing
42 maintain the O-ring 54 in position until the flow rate of the liquid 52 is sufficient
to shift the O-ring 54 in the distal direction. In one embodiment, the distal portion
58 includes sloping or chamfered walls 60 inside the chamber 44. As the O-ring 54
is pushed in the distal direction, the sloping walls 60 compress the O-ring 54 which
requires an increase in the flow rate of the liquid 52. This provides for a counter-force
that pushes back against the flow of the liquid 52 requiring an increase in the flow
rate if additional filling of the chamber 44 (e.g., additional cooling of the choke
28) is desired. Once the liquid 52 is withdrawn from the choke 28, the O-ring 54 is
moved back into its original position (e.g., in the proximal direction) by the compression
of the walls 60.
[0027] Fig. 5 shows a further embodiment of the probe 12 having a ferroelectric material
therein. More specifically, the probe 12 includes an internal ferroelectric loading
70 at a distal end of the feedline 26 and an external ferroelectric loading 74 at
the distal end of the inner conductor 20. In one embodiment, the internal ferroelectric
loading 70 may be have a length corresponding to the quarter wave of the microwave
frequency and act as a dynamic quarter-wave transformer.
[0028] The ferroelectric loadings 70 and 74 include ferroelectric material such as lead
zirconate, lead titanate, barium titanate, and the like. Ferroelectric materials provide
for dynamic matching of the probe 12 to the tissue due to changing dielectric properties
of such materials when DC electric field is applied across thereof during application
of microwave energy to the probe 12 such that the DC electric field biases the ferroelectric
material. The DC electric field is supplied to the loadings 70 and 74 through the
outer conductor 24 and inner conductor 20 respectively. As the DC electric field is
supplied to the loadings 70 and 74, the dielectric constant thereof is varied. The
"+" and "-" illustrate one possible polarity of DC electric field within the probe
12. As the wavelength of the frequency of operation increases due to desiccation of
the tissue, the DC electric field is supplied to the loadings 70 and 74 is also adjusted
accordingly to increase the dielectric constant accordingly. This counteracts the
detuning of the probe 12 due to the changes in the tissue. In one embodiment, the
DC electric field supply (not explicitly shown) may be controlled via a feedback loop
by the generator 14 based on impedance measurement of the probe 12 and the cable 16
and other methods within purview of those skilled in the art. In another embodiment,
the supply of the DC current may be varied in a predetermined fashion over time based
on empirical laboratory measurements.
[0029] The described embodiments of the present disclosure are intended to be illustrative
rather than restrictive, and are not intended to represent every embodiment of the
present disclosure. Various modifications and variations can be made without departing
from the scope of the disclosure as set forth in the following claims both literally
and in equivalents recognized in law.
1. A microwave ablation probe (12) for providing microwave energy to tissue, the probe
(12) comprising:
a feedline (26) including an inner conductor (20), a secondary inner conductor (23),
an insulating spacer (22), and an outer conductor (24); and
a radiating portion (30) including at least a portion of the inner conductor (20)
centrally disposed therein; and either:
(a) wherein longitudinal movement of the inner conductor (20) relative to the feedline
(26) tunes the radiating portion (30); or
(b) further including:
a choke (28) slidably disposed around at least a portion of the feedline (26) and
configured to confine the microwave energy to the radiating portion (30), the choke
(28) including an inner dielectric layer (32) and an outer conductive layer (34),
wherein longitudinal movement of the choke (28) relative to the feedline (26) tunes
the radiating portion (30);
characterized in that
the inner conductor (20) is slidably disposed within the secondary inner conductor
(23) to allow the inner conductor (20) to slide in and out of the feedline (26) during
tuning while continuing to conduct microwave energy, the inner conductor (20) and
the secondary inner conductor (23) being in electromechanical contact.
2. A microwave ablation probe (12) according to claim 1, wherein the secondary inner
conductor (23) includes at least one groove (25) and the inner conductor (20) includes
a corresponding stop member (27) configured to mechanically interface with the at
least one groove (25).
3. A microwave ablation probe (12) according to claim 1 or 2, wherein the inner conductor
(20) includes indicia indicative of a desired wavelength position.
4. A microwave ablation probe (12) according to any one of the preceding claims, when
comprising the choke (28) defined in claim 1, wherein the choke (28) includes a groove
(33) disposed within the dielectric layer (32),
the groove (33) being configured to mechanically interface with a stop member (35)
that is disposed on the outer conductor (24).
5. A microwave ablation probe (12) according to any one of the preceding claims, wherein
the feedline (26) includes at least one indicium indicative of a desired wavelength
position.
6. A microwave ablation probe (12) according to any one of the preceding claims, further
including a tapered end (36) having a tip (38) disposed at a distal end of the radiating
portion (30).
7. A microwave ablation probe (12) according to any one of the preceding claims, when
comprising the choke (28) defined in claim 1, wherein the choke (28) includes at least
one indicium thereon to indicate a desired wavelength adjustment position.
8. A microwave ablation probe (12) according to claim 2 or any of claims 3 to 7 as dependent
on claim 2, wherein the at least one groove (25, 33) and/or stop member (27, 35) includes
one or more detents which provide tactile feedback when the inner conductor (20) is
slid along the feedline (26).
9. A microwave ablation probe (12) according to claim 4 or any of claims 5 to 8, as comprising
the features of claim 4 and also comprising the choke (28) defined in claim 1, wherein
the at least one groove (25, 33) and/or stop member (27, 35) includes one or more
detents which provide tactile feedback when the choke (28) is slid along the feedline
(26).
1. Mikrowellenablationssonde (12) zum Bereitstellen von Mikrowellenenergie an Gewebe,
die Sonde (12) mit:
einer Speiseleitung (26) einschließlich eines inneren Leiters (20), eines sekundären
inneren Leiters (23), eines Isolationsabstandshalters (22) und eines äußeren Leiters
(24) ; und
einem Abstrahlabschnitt (30), der mindestens einen mittig in sich angeordneten Abschnitt
des inneren Leiters (20) aufweist; und entweder:
(a) eine Längsbewegung des inneren Leiters (20) relativ zu der Speiseleitung (26)
den Abstrahlabschnitt (30) abstimmt; oder
(b) des Weiteren aufweisend:
eine Drossel (28), die verschiebbar um mindestens einen Abschnitt der Speiseleitung
(26) angeordnet und eingerichtet ist, die Mikrowellenenergie auf den Abstrahlabschnitt
(30) zu beschränken, wobei die Drossel (28) eine dielektrische innere Lage (32) und
eine leitfähige äußere Lage (34) aufweist und eine Längsbewegung der Drossel (28)
relativ zu der Speiseleitung (26) den Abstrahlabschnitt (30) abstimmt;
dadurch gekennzeichnet, dass
der innere Leiter (20) verschiebbar in dem sekundären inneren Leiter (23) angeordnet
ist, um es dem inneren Leiter (20) zu ermöglichen, während des Abstimmens in die Speiseleitung
(26) hineingeschoben oder aus ihr herausgeschoben zu werden, und zwar bei fortlaufendem
Leiten von Mikrowellenenergie, wobei der innere Leiter (20) und der sekundäre innere
Leiter (23) elektromechanisch in Kontakt sind.
2. Mikrowellenablationssonde (12) nach Anspruch 1, bei welcher der sekundäre innere Leiter
(23) mindestens eine Nut (25) aufweist und der innere Leiter (20) ein korrespondierendes
Anschlagelement (27), das eingerichtet ist, mechanisch in die mindestens eine Nut
(25) einzugreifen.
3. Mikrowellenablationssonde (12) nach Anspruch 1 oder 2, bei welcher der innere Leiter
(20) einen hinweisenden Anhaltswert einer gewünschten Wellenlängenposition aufweist.
4. Mikrowellenablationssonde (12) nach einem der vorstehenden Ansprüche, wenn sie eine
im Anspruch 1 definierte Drossel (28) aufweist, wobei die Drossel (28) eine in der
dielektrischen Lage (32) angeordnete Nut (33) aufweist, und
die Nut (33) eingerichtet ist, mechanisch in ein Anschlagelement (35) einzugreifen,
das auf dem äußeren Leiter (24) angeordnet ist.
5. Mikrowellenablationssonde (12) nach einem der vorstehenden Ansprüche, bei der die
Speiseleitung (26) mindestens einen hinweisenden Anhaltswert einer gewünschten Wellenlängenposition
aufweist.
6. Mikrowellenablationssonde (12) nach einem der vorstehenden Ansprüche, des Weiteren
mit einem sich verjüngenden Ende (36), das eine an einem distalen Ende des Abstrahlabschnitts
(30) angeordnete Spitze (38) aufweist.
7. Mikrowellenablationssonde (12) nach einem der vorstehenden Ansprüche, wenn sie eine
im Anspruch 1 definierte Drossel (28) aufweist, wobei die Drossel (28) auf sich mindestens
einen hinweisenden Anhaltswert zum Anzeigen einer gewünschte Wellenlängeneinstellposition
aufweist.
8. Mikrowellenablationssonde (12) nach Anspruch 2 oder einem der Ansprüche 3 bis 7 in
Abhängigkeit von Anspruch 2, bei der die mindestens eine Nut (25, 33) und/oder Anschlagelement
(27, 35) eine oder mehrere Rasten aufweist, die ein taktiles Feedback bereitstellen,
wenn der innere Leiter (20) entlang der Speiseleitung (26) verschoben wird.
9. Mikrowellenablationssonde (12) nach Anspruch 4 oder einem der Ansprüche 5 bis 8, wenn
sie die Merkmale von Anspruch 4 und auch die im Anspruch 1 definierte Drossel (28)
aufweist, wobei die mindestens eine Nut (25, 33) und/oder Anschlagelement (27, 35)
eine oder mehrere Rasten aufweist, die taktiles Feedback bereitstellen, wenn die Drossel
(28) entlang der Speiseleitung (26) verschoben wird.
1. Sonde d'ablation à micro-ondes (12) pour fournir de l'énergie micro-onde à un tissu,
la sonde (12) comprenant :
une ligne d'alimentation (26) comprenant un conducteur interne (20), un conducteur
interne secondaire (23), une pièce intercalaire isolante (22) et un conducteur externe
(24) ; et
une partie rayonnante (30) comprenant au moins une partie du conducteur interne (20)
disposée en son centre ; et soit :
(a) dans laquelle le mouvement longitudinal du conducteur interne (20) par rapport
à la ligne d'alimentation (26) règle la partie rayonnante (30) ; soit
(b) comprenant en outre :
un piège (28) disposé de manière coulissante autour d'au moins une partie de la ligne
d'alimentation (26) et configuré pour confiner l'énergie micro-onde sur la partie
rayonnante (30), le piège (28) comprenant une couche diélectrique interne (32) et
une couche conductrice externe (34), dans laquelle le mouvement longitudinal du piège
(28) par rapport à la ligne d'alimentation (26) règle la partie rayonnante (30) ;
caractérisée en ce que
le conducteur interne (20) est disposé de manière coulissante à l'intérieur du conducteur
interne secondaire (23) pour permettre au conducteur interne (20) de coulisser à l'intérieur
et à l'extérieur de la ligne d'alimentation (26) au cours du réglage tout en continuant
de conduire l'énergie micro-onde, le conducteur interne (20) et le conducteur interne
secondaire (23) étant en contact électromécanique.
2. Sonde d'ablation à micro-ondes (12) selon la revendication 1, dans laquelle le conducteur
interne secondaire (23) comprend au moins une gorge (25) et le conducteur interne
(20) comprend un élément de butée correspondant (27) configuré pour être mécaniquement
en interface avec l'au moins une gorge (25).
3. Sonde d'ablation à micro-ondes (12) selon la revendication 1 ou 2, dans laquelle le
conducteur interne (20) comprend des repères indicatifs d'une position de longueur
d'onde souhaitée.
4. Sonde d'ablation à micro-ondes (12) selon l'une quelconque des revendications précédentes,
lorsqu'elle comprend le piège (28) défini dans la revendication 1, dans laquelle le
piège (28) comprend une gorge (33) disposée à l'intérieur de la couche diélectrique
(32),
la gorge (33) étant configurée pour être mécaniquement en interface avec un élément
de butée (35) qui est disposé sur le conducteur externe (24).
5. Sonde d'ablation à micro-ondes (12) selon l'une quelconque des revendications précédentes,
dans laquelle la ligne d'alimentation (26) comprend au moins un repère indicatif d'une
position de longueur d'onde souhaitée.
6. Sonde d'ablation à micro-ondes (12) selon l'une quelconque des revendications précédentes,
comprenant en outre une extrémité conique (36) ayant une pointe (38) disposée à une
extrémité distale de la partie rayonnante (30).
7. Sonde d'ablation à micro-ondes (12) selon l'une quelconque des revendications précédentes,
lorsqu'elle comprend le piège (28) défini dans la revendication 1, dans laquelle le
piège (28) comprend au moins un repère sur celui-ci pour indiquer une position d'ajustement
de longueur d'onde souhaitée.
8. Sonde d'ablation à micro-ondes (12) selon la revendication 2 ou l'une quelconque des
revendications 3 à 7 lorsqu'elle dépend de la revendication 2, dans laquelle l'au
moins une gorge (25, 33) et/ou l'élément de butée (27, 35) comprend un ou plusieurs
cliquet(s) qui assurent une rétroaction tactile lorsque le conducteur interne (20)
coulisse le long de la ligne d'alimentation (26).
9. Sonde d'ablation à micro-ondes (12) selon la revendication 4 ou l'une quelconque des
revendications 5 à 8, comprenant les caractéristiques de la revendication 4 et comprenant
également le piège (28) défini dans la revendication 1, dans laquelle l'au moins une
gorge (25, 33) et/ou l'élément de butée (27, 35) comprend un ou plusieurs cliquet(s)
qui assurent la rétroaction tactile lorsque le piège (28) coulisse le long de la ligne
d'alimentation (26).